LTC3218 Datasheet, PDF (3/12 Pages) Linear Technology – 400mA Single Wire Camera LED Charge Pump

LTC3218
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C, V_IN = 3.6V, C_IN = C_FLY = 2.2µF, C_CPO = 4.7µF, ENF = HIGH, unless
otherwise noted.
PARAMETER
Charge Pump (CPO)
Charge Pump Output Clamp Voltage
1:1 Mode Output Impedance
1:2 Mode Output Impedance
CLK Frequency
ENF, ENT
High Level Input Voltage (V_IH)
Low Level Input Voltage (V_IL)
Input Current (I_IH)
Input Current (I_IL)
Flash Timeout
ISETF, ISETT
V_ISET
I_ISET
CONDITIONS
V_EN = 3.6V
V_EN = 0V
ENF = HIGH
I_SET = 110µA
ENT = LOW, ENF = HIGH
MIN TYP MAX UNITS
5.3
V
1.3
Ω
7
Ω
1
MHz
● 1.4
V
●
0.4
V
●
14.4
30
µA
● –1
1
µA
2
s
● 1.18 1.21 1.24
V
●
181
µA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Based on long-term current density limitations. Assumes an
operating duty cycle of ≤ 10% under Absolute Maximum Conditions
for durations less than 10 seconds. Maximum current for continuous
operation is 150mA.
Note 3: The LTC3218E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C ambient
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
I_LED Dropout Voltage
vs LED Current
0.009
0.008
0.007
0.006
0.005
0.004
0.003
0.002
0.001
0
0
100
200
300
400
LED CURRENT (mA)
3218 G01
I_LED vs R_SET
450
400
350
TORCH
FLASH (ENT = LOW,
ENF = HIGH)
FLASH (ENT = ENF = HIGH)
300
250
200
150
100
50
0
0 50 100 150 200 250 300 350
R_SET (kΩ)
3218 G02
V_IN Shutdown Current vs V_IN
3.0
T = 25°C
2.5
2.0
T = –40°C
1.5
T = 85°C
1.0
0.5
0
2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5
V_IN (V)
3218 G03
3218fa
3